液(ye)晶廣(guang)告機插上電(dian)(dian)源后沒(mei)有反應是(shi)實際應用(yong)中(zhong)經(jing)常(chang)出(chu)現的(de)一個問(wen)題。對此，用(yong)戶可(ke)以試著取(qu)下廣(guang)告機，打開廣(guang)告機的(de)后蓋，檢(jian)查專用(yong)電(dian)(dian)源是(shi)否通電(dian)(dian)，現材是(shi)否脫落或 者松(song)動。具體方法：用(yong)萬用(yong)量下指示燈是(shi)否亮，如(ru)果(guo)正常(chang)則表明電(dian)(dian)源是(shi)有電(dian)(dian)的(de)。排除了電(dian)(dian)源問(wen)題，用(yong)戶要依(yi)次檢(jian)查通上解碼板(ban)，廣(guang)告機驅動板(ban)，高壓(ya)條，喇叭，液(ye)晶 屏的(de)通電(dian)(dian)情況。哪里(li)(li)不(bu)通電(dian)(dian)就(jiu)表示廣(guang)告機哪里(li)(li)的(de)配件出(chu)現問(wen)題了。